Patent GB-504969-A (GB)
Title: Machine for winding armature coils
IPC: H02K15/04
Filed: 1938-04-07
Abstract: 504,969. Winding and cutting wire; coil-winding apparatus. CULLIN, J. F., MERVIS, M. B., and MERVIS, L. April 7, 1938, No. 10699. [Class 120 (ii)] [Also in Groups XXII and XXXV] Wire coils for armatures are made by a machine in which a pair of wires is carried by a rotating arm round a non-rotating former. The former is constructed in two sections which can be separated when the-winding is completed so that the finished coil can be removed, and the cutter which severs the wire forms a hook upon the remaining wire to start the next coil. The sections 31, 37 of the former have interlocking shoulders, and while they are separated before the winding operation commences, the link mechanism 83, 85, 88 for shifting the cutter blade 78 is in the position shown in Fig. 9, and the blade 78 is in the head 74 after having severed the previous coil against the edge of the lining 77 of the head, and after forming a hook a<1>, Fig. 11, at the end of the remaining length of wire a<2>. The switch 92, Fig. 3, is open so that the electromagnet controlling the driving motor is not energized. The operator first closes the former 31, 37 by moving the tail stock 33 and the section 31 on to the section 37. This operates the link 83 which is attached to the tail stock 33, and the links 85, 88 are moved to the positions shown in Fig. 1 independently of the head 74, and the link 85 strikes the projection 122 of the trip arm 120, Fig. 3. This trips the latch 117 to release the stud 114; the spring 116 then closes the switch 92 and also slides the bar 115 to the left so that the pivoted arm 110 with its spring- pressed dog 109 is in correct position for the winding. The switch 92 closes the circuit of an electromagnet which opens a valve to supply pressure fluid to the motor 56, Fig. I, and this rotates the hollow shaft 39 by means of chain gear 58, 59. The shaft 39 carries the winding arm 46 which has an offset end with a pulley 51 to support the wire, and a cam 90 to lift the cutting blade 78 from the path of the winding arm ; a pivot 52 supports the arm on the shaft so that it can swing longitudinally against the action of the spring 55. The longitudinal movement is determined by a cam 53 supported on the shaft but rotated, through gearing 64 ... 71, at a slightly lower speed than the arm 46. The blade 78 is lifted from the position shown in Fig. 3 to that shown in Fig. 1, and as the ends of the wires are held by the hooks a<1> to the head 74 the rotation of the arm 46 will wind the coil on the former 31, 37. The cam causes the arm to travel backwards and forwards axially to lay the winding. When the cam has made one revolution relative to the winding arm, the spring 55 causes the arm to swing longitudinally and the roller 54 on the arm enters the notch 43a on the cam. This longitudinal movement laps the wires a round the guide 80 on the cutter head 74 and across the slot 75 bounded by the plates 76, 77. During the winding operation the dog 109 rides on the periphery of a disc 104 which is driven directly by the shaft 39 and so rotates with the arm 46, and on the periphery of a flange 106 on the cam 53. The disc and flange have notches 105, 107 respectively, and these two notches are brought into register when the wire is lapped round the head 74. The dog 109 drops into the notches and the shoulder at the end of the notch 107 engages the dog 109 to cause the bar 115, Fig. 3, to move to the right to open the switch 92 against the action of the spring 116, and the latch 117 then moves into its locking position to hold the switch open. While the dog 109 is being operated in this way, the trailing end of the notch 105 lifts it again to the periphery in readiness for the next winding operation. A disc 94 on the shaft 39 is also locked by detents to prevent any rotation. A clip of the type shown in Fig. 15 is then attached to the coil to facilitate further handling, and assembly in the armature cores. The operator then retracts the section 31 of the former and this retraction operates the links 83, 85, 88 to project the cutter blade 78 into the slot 75 in the head 74 to sever the wire and to form the hooks for the next winding. The clip employed has spaced plates 125, 126w ith an intermediate movable bar 132. Flat spring strips 128 are secured to the upper plate 126 and pass under the plates and across the open front. The bar 132 can be operated to depress the inclined portion 130 of each strip so that its end is moved to clear the clip opening. The clip can then be moved forward to embrace the coil, and backward movement of the bar 132 allows the strip to move up to close the opening with the coil in it. The wire is fed to the winding machine from the de-reeling apparatus shown in Figs. 24 and 25. The reels 139 of wire are each carried by a hollow shaft 140 fixed in a frame 141 on a shaft 142, which is driven to rotate the whole structure by an electric motor 144 through reduction and belt gearing 145, 147. The discs 149 at the ends of the reels have curved peripheries and are removably secured to shafts 151 which extend through the hollow shafts 140 to the rotating frame 141 and are driven by pulleys 152 by means of a stationary friction. pulley 153. The wires from the reels pass round the peripheries of the discs 149 and guides 154, 155, 156 to rollers 157 and then pass through the hollow shaft 39 to the winding arm 46. The guides and rollers are carried by a sleeve 159 which rotates with the shaft 142 and so prevents the wires from twisting. The circuit of the motor 144 includes a switch which is automatically controlled by the winding mechanism through the instrumentality of a screw element which advances or recedes to move the switch to its closed or open position at the commencement or finish of the winding operation.